Nitrate Additives Coordinated with Crown Ether Stabilize Lithium Metal Anodes in Carbonate Electrolyte

A rubidium nitrate (RbNO3) additive coordinated with 18‐crown‐6 crown ether is proposed to stabilize the lithium metal anode in the carbonate electrolyte. A coordination reaction between them promotes the dissolution of NO3− ions to form a dense and Li3N‐rich solid electrolyte interface and generates the Rb(18‐crown‐6)+ complexes as stable shielding ions to suppress dendrite growth.